GRE three-layer tunnel package configuration

Experiment topological diagram

1. Experiment Description: The router site1 and Site2 respectively simulate the company's two sites, 1.1.1.0/24 and 2.2.2.0/24 simulate the internal network of two sites respectively; Router ISP simulation service router.

A point-to-point GRE tunnel is established between Site1 and site2 through GER technology, and OSPF is run on the GRE tunnel to learn about each other's internal network routes.

2. Basic Network Configuration

Site1:

Interface fastethernet0/0

IP address 172.16.12.1 255.255.255.0

Duplex Auto

Speed auto

!

Interface FASTETHERNET0/1

IP address 1.1.1.254 255.255.255.0

Duplex Auto

Speed auto

!

IP Route 0.0.0.0 0.0.0.0 172.16.12.2

Isp:

Interface fastethernet0/0

IP address 172.16.12.2 255.255.255.0

Duplex Auto

Speed auto

!

Interface FASTETHERNET0/1

IP address 172.16.23.2 255.255.255.0

Duplex Auto

Speed auto

Site2:

Interface fastethernet0/0

IP address 172.16.23.3 255.255.255.0

Duplex Auto

Speed auto

!

Interface FASTETHERNET0/1

IP address 2.2.2.254 255.255.255.0

Duplex Auto

Speed auto

!

IP Route 0.0.0.0 0.0.0.0 172.16.23.2